SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '389b98085f8e1efd87778fc2cf1ba00f2aa38a9b43bbfb574c4e6b62896584c6' 
  AND token = 'Vwx1hgegUbHW+YOuSGf+2ERJhifqE0Je+zi9j34clVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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