Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c1578fa3b998a4e6d7bd9af00a0af43de7795a6e495fed54970241eac8c1c3e' 
  AND token = 'pnPNbYcRcWQi+SD0wPWok1rqIY2XkUB8h0WtkV2b83E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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