Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2691e9cf5651311020fe1c53d15bf23b35d75ad6afeb555051aa234daad7ba2' 
  AND token = 'rWyTN/ysaYMVXvUbyE5iS0GDnYEW/poPDYpZYUjdkvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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