SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bfac187c505ed76be4014da21b8ff4aa431a865c79b87e0cbb3fa4e6736c76b' 
  AND token = 'qJHPg1fOIruKHHoH6qCPhpLjpfJM9vsjwRVMX1hBzCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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