SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9479f9b01efa9f97978abb74ba09051c8022ed18ff1b08a27d4c13ed6f483eed' 
  AND token = 'K0lhFXrHqrA7ZL6J2v/qf7L7oY6/DB6StvNLqVlUoAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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