Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8fbce2dc2ad864321d42dff10d287909bba1f9e455717871bd3e42b2dfd97a6' 
  AND token = 'zYJdV4RyM8UT2sfWL1AyLGCAoU0Up2hKrKFwQMVjY3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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