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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7505d56903d600f913572b50569513cd2b9a7dba3379641d4975cd8d1a204544' 
  AND token = 'jKRA3tOIs6qJT9+ugBmyv3Ui2sQVrc4MJ17HXV4nWy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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