SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54832f0f0752448fad8e2d5e63662128932243258c77ec6d1eab62b29148358f' 
  AND token = 'rMbgEN6j4HdJCTGtczzXnyaLZLKvF4VsRefWFbo2p/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables