SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccf43d3af7427fb41738a157482434276a6a4dcb17916a8f8bbd020cb3164ae5' 
  AND token = '5wgQOUr4G5JVqKxaoXkIAnXwHhuwnouh3iBcIp90poM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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