SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '172ca0e576684b91f9d537f912a3b20941cfabed1f27969cefdc3c1602653d68' 
  AND token = 'TqDQtyWX3I4HJuPrS8HOZgrYJlYf0nurQ0RBwovB1K8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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