Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb9b481e9d9eed99d6b1a211f6a938d8e1e38575b4353249fd421d7a5248a7b2' 
  AND token = 'LTH0PmVYFYAb8VMgsAzC+uQryAEe78l9eWB9PmlXiRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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