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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2411fc8fe2e6bf33fb7c99e7503c5ffe97dd8a3d58cba573e301b2693a7236f8' 
  AND token = 'sMOUpK/NCoaxoinWTWhWV3o+lzcwKFqpb+Kk83S3Oow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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