SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d911d0632549c65a73f5c6e29bb3a3cbdb6e0241f49d6bc6168abef7ddbd739' 
  AND token = 'nzthjLVFLbfk9zrqmpPNfSy34onYzqpTJ2hyJv+hqgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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