SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd08fa7c002df099d8e756834f533b7263ad3fb18ccae5f56d6ad672a0e6499df' 
  AND token = 'GvUdgHifUvJxZjFgl59BMizuyU9Xxmg4O3bi1QC/+Fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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