SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5333f4edbf2a8aad09049c9a7011aca9bb176b29960e343fe48d35bf868679e4' 
  AND token = 'GmPD7ujOlC3fYbg5MZYQiuoL2iiU5FafUgBpZBDqFKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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