Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c44e5f8c5234de2032404129ddc4a123db56a183ae9e4773781093d1d3b7c40d' 
  AND token = 'j+oEQ0f4co5kvY84QmMmZT9wBinWbRxFBi+bj0n+3xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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