SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e3d4fc7043f291ce2fcbb84462193904ead2978eefdffda665320d0aec2bc50' 
  AND token = 'sPVLvKWHkQ+UhBBCq+H4XHo7KD/jQTMLKF4rtFfk96E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

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