SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1240d57acbb91fedbf982a0bef62b17544a7c91b3aaf0fd80e839fa6eb6738d5' 
  AND token = 'fGyoMEEhzpjKw+7qOHIUjrooBnvngsNHk+CNP7OF/KQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}