SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32fe3a9042fa8a156da3070d260625b008f93911d86bb7c6e8ddb3c154d47e95' 
  AND token = 'PRiZgBtXHtxpnAFGIYXLT4row62zHwDOzyTdB6CkSQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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