SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '051ad480343b39599d0325b6e4e214cbf7d80be56d504a90d960f1d615d87d7d' 
  AND token = '8Cbza1SL3detAVqKp71oVi+YhtL7BV88njxTtz6RZ8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

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