SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58e065368a8482bfb0b45410746555ca8b62159ed496f8af161bc19b2942fb41' 
  AND token = '6VJZtGRv20MqFkXvK5sFOfFjYme3ZFCdFvnK3/0l2zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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