SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09f5744306f3a713f4458bb2b63af157c6beabf69d075410b8d8aebc17a3ddd4' 
  AND token = 'qvNq2s0wM8UFRtLKM9I7DhEkZiHhCeP84xEvjf+uypY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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