SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2e43c522c656a56e520f1d5c395598e7f00f93023b8ff53d7b7f04687e44751' 
  AND token = 'OYGsFCqBaDkdhvdWgVOzzNB9DnPG/jZ91l0rp+mxpWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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