Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bc3bc3195a15c79555a7000f3f74532e4bcaba7e129190221da7534fecf1ea3' 
  AND token = 'mkB4vwErQIQxR2UVI9onWtMsTt6xtNK579MykT+SW04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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