Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7379a06b3bc3efa55789f29450440f4e1fd856fb5932ed8b863e43a2250bac9f' 
  AND token = 'Eb++1cj+4TEtJycwVlSgmf5xA0T5bVDI+Sz5DM2sM6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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