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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99f3b12508e3e18446c718b5af216af3851d55a608ab49d47a9ca30996b36813' 
  AND token = 'fm/+LYyuUVGS+eVkpVF41ExbQbIr/96nh1dAMNHFJPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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