SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1846b22d8d9c8591f22abb3e4ea29769b1333fcde70050b4b4c66d811834f36f' 
  AND token = '/O8Jf4pEiBgRIvjeMaD+cA8DztWUvzAGqukz94gIoVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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