SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e12ab39fdbf4172d31c9d4814dddc92c3994b916f5d6371ce896c7813fbe478' 
  AND token = 'ZGIlo3ilaqoKXCiRjv2lBznxdmAta/Kw6QqxNHzT7fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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