SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03eb56235c717fab90a36bf2360c5216d6c3cbfd28154081a13aa53288821662' 
  AND token = 'DvOLBMUVOfY1giSwXYnSpftZXLlguLpuJJDj5QwvGZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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