Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5d12d712231d02ab1e6ee2effe9c8ec1c03cf8c4b9e8541bc2e42ecde969ff8' 
  AND token = 'uKCO69ZY0FJPJXvYNYgiQfa1x6PmNmdLGBDhnPAxvMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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