SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f57381f03312ff9c49c0cbd77c41af4743aa57c46261ac53d9459a861a3c82f' 
  AND token = 'VqnFlDPvglHomAVhNdPXHJ/ligkv7/I2c4mgjvJR7ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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