Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54024e54103b84504af3e8ab1f9573a3f981b1ad0a7b42249ef4d856a9076ac5' 
  AND token = 'eCHdZSubkxpwn5SsHR6OY0E8q+rzRUojvBVdQw3R2SQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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