SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b713d287ea1cd8e86c8c743684a4dffdcf5fe2fafb0a649cb5673d47d655d9f' 
  AND token = '00+6sqAXpEg1GDMbOsGxBRqCmsO/kbBvB5PPlkVfwKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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