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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbc9407a4db50cd22469ef12b4e0a2ff6517fd10ee8ac7b183853e9b10af08d8' 
  AND token = 'HP5cnrf6rUdj14yn2VNfRf/CKeff876KPO6VwYItyGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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