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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb28447d5c7a8d45238922d5ffcf6130ffeeed5c6036b00fca405d63d5a3f717' 
  AND token = '9K7HT/PtxOo4bX6IY3gJTW7eSt0cFHqiKNp/muSZjyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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