SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '602071ea3b1cc80d1fa22a807029633e738634fb017da599c7f4bc7bd5eac923' 
  AND token = 'aHF+CIrx8VLbqlBDFhAz7/VaYOQunK0UCaHAqPvfQ3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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