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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8018b69471c1aaa8f9cc9a0831c21bae8952635067285d7bf5d49dd75983f873' 
  AND token = 'l8jqreT32mIyajOHQw/1qFSij2MXc4t+ZqiLz8cFvqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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