SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f9c86fb010e057d4c46948528306201b9e181213128943d003421567650249f' 
  AND token = 'Ww63wBPfDwY3/ZdHZpuOb3MY7jV19Xvt5INUFq4Gw1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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