SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a692a1fa7ee587ffd6edefe84ac50e035f953335881f8b34a276a6c8aa7899bf' 
  AND token = 'WoCSERA33foDW+xSnT//9XXXldLguFSn7qUPkBNfqyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

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