SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd169f20eaaa5449e56aff8372ca85449041d1bc8179cf312c9d91bbee0564f55' 
  AND token = 'upQcqUSq7Ynx+80cG98sKVGJl9psj/TKnJYZTA/opf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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