Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10cfa5d26e88361fc2c530aca07e233ab0d6e609e80c1b56970c7571c0da9b56' 
  AND token = 'WPY4uOiOKv3PoiEs37N5XV7I8s6zQCNgje1SZhJJ5yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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