Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d9526386714087d2a58bf3427d0f1271af89b41e138acde35dc75c84432c704' 
  AND token = 'wTc+UKXM480iop8itOGUNh4vaZmBNowJbm+b8i0lIAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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