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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5c48f149f62361dfcd262096c58f71a7c8da279c093f38090cb743c05cb8f8a' 
  AND token = '6NoFeq+5UMyL6ZTeDCid4j1lb1b7/N0KBBuNs0+VWEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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