Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec82bc27f5b140ceb7385eb1f78f84728b069f4ea63ec0290ecfae7999098a18' 
  AND token = 'OgtwOl6d8pY8zd8wtCykEetFprWPmrsILzhGVyLMCAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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