This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
鐖 combines 金 (metal) with 幾, which likely contributes a phonetic element. The exact historical development and original meaning are uncertain.
The metal radical 金 suggests something made of metal, but the overall meaning is unclear. Picture a mysterious metal object with an intricate mechanism (幾).
For キ, imagine a key (キー) made of metal (金) that fits a complex lock (幾): key -> キ.