SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6cd4e931e4e72b6bc30acfa1287307c78f9b24ab545da26e61ebebd8813fa58' 
  AND token = 'H9H+zG8qrYdYoP5mGBxcQJis7BuUTNNVzNv4qpFWibI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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