Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ebf9d2aebe7b4f2af6b69207e0408b3a7c1daa43918470d493f4fff83687de5' 
  AND token = 'vOCsrfn4Dmq8yDjMJpFCCrzhpVvtlZZNFwra6ojSosc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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