Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97b0d0e445abcb579aa62618904c222bb49ca6407f234d8283c5311c188183a5' 
  AND token = 'vR64gixKGa+5BnA5PMWAayZc30A2EGjiDMatxNkdknM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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