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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50ff218274d95cbdd943de1b32aada21e3c54bf678730b7354ff44f93fc48c0c' 
  AND token = 'BwMdOWjzkx3+DaV7dmFDpuk1YB4CF9mQriMB+Cj5lUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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