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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3060a5d6e8577017a335498bb520ab817b931a8fa3094b7eedeb7676974e3ba4' 
  AND token = 'iratQcMMRO/JZqhrHxQNMQXjZhRS4tDgOV/YAXtD5FM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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