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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f6a223b4bd90e7c2c53dd6a2ccab471b61e0b915076dcde9b0ef4d31674f3c9' 
  AND token = 'PZL7mNVCbhLviYPhOjihuRGvbOv1NIhIevDQCxR5T2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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