SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19cca3269464c925fb84c899365316e9066bf21a6ae1474ee3897a4465b3fc5a' 
  AND token = 'OLMyrGzZVmoxVKROwskE5Dh+P2yfWrtzgUQ3XukedFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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