SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '053e7cd2c2ad24f81c41ab6b114d059af3229811a92362f5766167f95dcb890e' 
  AND token = '8F9WqrcsoLh3oAOUkXgZfUmHYY4xIJL9IA0w+yHnqK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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