SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3df430150cf3cba705b612e96e6346f629d0b81d8d22e6728b798766229f7f00' 
  AND token = 'doltu7iQKN9V4JZRYO7XhpGOjtzlzKkpWjZvmAKfL80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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