SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e832e69bc449b185066421da474c0762c00fd9dfc9311dfe09c6ab67158b741' 
  AND token = 'KWxbyjOz/8+pXxDETak0MKG3nvaIJljdtOdqrhQi4sY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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