SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cd7401cdcc4f50b8dffbeccea8de33098b63f12ac66d1b43280b3fafb039e66' 
  AND token = 'kh85dvEHLeUmMAFTmRA5DGWgYWJx1WJ8e6/qwFrFdJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

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