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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcbe4b4ec97bd49f862e547ad66176a9b6211930bb9204301b0c893646f0cbdf' 
  AND token = 'kQ7nFhv68q/sg0fZKCqe+wsFHLem5I0QdtfvsVM+Po0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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