SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43474c95c9cdb8a92eb9eabce7971b6d608fc73566cbb23afe8809e280c878fd' 
  AND token = 'H+SLfmzvEvpAFBInRYb3dUq7Sr/Tgc8JMnlG3XqmVG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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