Getcha key here.
Hextech Chests are a new inclusion in League of Legends and they contain plenty of cool items, but first you must know how to open them. You’ll need a thing called a Hextech Key in order to open these chests, and they’re made up of Key Fragments.
You can get Key Fragments by winning a random match, and if you lose then you get nothing. The important thing here will be to pair up with friends because if you win a matchmade game then you will find more Key Fragments. Once you get three Key Fragments, you’ll be allowed to create the Hextech Key. Thankfully, unlike the chest you can play ARAM or Twisted Treeline and still get Key Fragments as long as you win. It should be noted that the more Key Fragments you get, your chance of finding more in the future goes down. This will go on until the system resets about 30 days since you received your first key.
The point of doing all of this is in order to create the Hextech Key to open up the chests, but if you want to avoid the time and work or just in a slump, you can always buy the keys themselves. One Hex Key will cost 125 Riot Points in the League of Legends client store. They also have bundles of Hextech Chests and Hextech Keys which range from about 200 Riot Points to nearly 2,000 Riot Points.