SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1497ac82c0db00aa64df0051acbd5f9136b3b90b549e06427cc1523d58aada6d' 
  AND token = 'rfEqKzGTsu6vibDe2ZAlGutmMUKdQQdbJWuf++ljUxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

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