The Enchanted Keys & Dusk Boots was a pack that could be purchased from the Zen Market for 
2,250.
It contained a keyring with 20 
[Enchanted Key]s and a pair of Dusk Boots in a 
[Dusk Boots Pack].
It was discontinued and replaced by [Enchanted Keys & Void Locket] in Module 9: The Maze Engine (Patch NW.60.20160307a.4).