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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc9eb9e38eb7347b838ece570235a67967e4f76768046475e38ce0c060d533bb' 
  AND token = 'vsiTfAd5IC+Xi+wQxt1QYWIEcTU1hyuN1g0Jpe4rIVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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