SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be1d887f6eb18b44950f4fd8a6e3712b352de96b188dd0e42273961aa74c9daf' 
  AND token = 'xiBGyyHNaPOmQaiEa9crDbJsoTmQ28DvemknE/f2ceU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

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