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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '025347e04f8b05e3a7e8b69628aeecce6d947f4d5b5e2e292f143f6a8094225a' 
  AND token = 'XJ1x2LGign2bGGkggK6uO1mrqxJLLy9ODlGoGzov9KU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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