SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09f82c7c8863483b7429a27e089e3a17cd3733581f4bf93f39f79f7446bd03a5' 
  AND token = 'Ck1nSoIDjBxYVMGuJE6EFdo2SsKWK8+EDsiMhwspuvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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