Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1152e4c747c60965f478d5d7ce4af207c8fa729ba4da19aaa7d7e346e11cff50' 
  AND token = 'qNG52cHHFK7Gu8yMfIsxQEMOpJhhdg1gybY+eIj6P6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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