if your key is worn down - then get a brand new key from Honda, and keep a spare new key just in case, most of these streetside "chaabi waalay" will mess up the ignition barrel.
as a safety precaution - do not hang tons of keys on the keychain holding your car key, It accelerates wear - and never ever spray WD40 into the keyhole, it will gum up the lock, powder graphite is used to lube locks.