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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0591a651f130c723966ce1a573759f69ef301c15ad2f70ae875b6cc3ef441cd4' 
  AND token = 'dX8+1vW0T5WPedzB/tI6KoYFhLDWZ8eQrOHdLDYh060=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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