SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbf3b8b49e40663734f1e99ae2691157a2527e66aea033e1a987ad83becec972' 
  AND token = 'JE+oMkg9/7mOYysn6dGxJDwurW8RqYV7JfYzPHhmIzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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