SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bec43c71a349d45ab5720a96d6ca853bd6d36eb6192340104f452f653e61230a' 
  AND token = 'VhrJCf0RaKYsZ9lRHZEWjcpwDh6jXB/v06wamMwcHrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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