SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11b0f86328014227a6f9495d7293cfd605fd96f7c93b5452c55bf4e82acad64e' 
  AND token = 'H5dX+ZH8TgWpGqA+xFR2FtTa6yDCHqWPMF27p1gzZjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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