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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bf8c693ddfc3e2d494f2d33e314a0e4fa50a992d3a0bbe42e07cb50efd6a34d' 
  AND token = 'NCKgZhXsT60wBzaEZV83oQuaUi4mKkKJaSXRXFMNKn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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