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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9571a4da4af1bd13a9c1a57389b64c6a286a8e77af114fb849b1e029e0ff8a27' 
  AND token = 'UNiDoPlNpDDJQQsy7tDT0X9BQOsmPx5Ie7hdFB701tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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