SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6222a39914fe063b6991b8943d18a05863ef2f3bccf79e313ea215381adb0b0e' 
  AND token = '0m811fCZqUTnWJfcYwjqB4lf/ZVX5I7ooRgFGcZx/pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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