SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd0caef46f629ff4d3560c8a47b4123d8ee08a417ab055e8383f187681a53c57' 
  AND token = 'kT19O6KHg8SXWHdGecGptPH9IVd4n0syfQ+zrQWwe9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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