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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35b21f1ef2bacb22398ea47cfa3ff076bccced0c62764a1269e4ea22fb229e5a' 
  AND token = 'dD14GrvjktYCiv5Aft99V6hxWv4W3uva8NKeea6h88w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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