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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '889f9637cf1ca7c4f9072e3d110c0491b62f13d9ca933ba6bddccf7c536e54bd' 
  AND token = 'XMf+q01oK3k13QgpXqMl/Re+H3MmSv8fkSql8lOlRlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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