SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '966106d9455eaeed39b5fea000b7e4de64fea5233ff137212a93849391908ba9' 
  AND token = 'nhSxCgHRzA6dpVZVwgvyTcp2tiRG/UC6CmNyu4+Jdi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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