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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '422fcc7b1c36b0f16eb357fbbe7f829fc2f2605604b78eac9cdac01c9d3896c9' 
  AND token = 'CkGmCVwibAfcvcm7JZL7Vv7B1o7Bsu3nkJf/y5NjkYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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