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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd52b9f7c59e40e062a5f8aa36832352cdd50eec6aeff0b9483a1e4bc9057f976' 
  AND token = 'i66Sr2K8dvXFxAelkpoGvplype+RvdBYUuzcHrhm4XE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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