SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bdfcb56692e5c3cdf9ed219d6fc28049f93901984cbf8a7f127157d28f9fd58' 
  AND token = '9IYpSlXuVL5+j/xqt4l7sY7GeDsp8VYZk9P/JTVmZvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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