SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47ec7a8c878a182506f669e95e24c8e9d8b71dcab404320abbf72abace40b736' 
  AND token = 'hIwCVXMmDLYU1ZFDHZrMwz7mMJQruMMhWzgFKciNPcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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