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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe34f6a9acb8058483b8722278518713b9340a393fa1d3e6247e32933c9f2858' 
  AND token = '8Ii4A9lUdgyZcDB6j5upl8GyNm3mdlXQDGgF5d01wcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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