Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50e63c7b00d23a98452cbb9f62b9a01192c6ca28c04c62a9c215a2355617b015' 
  AND token = 'GX2AtryH8JBmya6MEjuNEPyxKOkJy+VAbNdtHqGz8ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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