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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93b6c5bfe15c90fffa5d73babd47edcd3ecd5a343ed53de750345cbc0aa77ae7' 
  AND token = '3QUOt/cdcuOnx6pBKP0cJNk7koQD4gLlzdx5DnOJkdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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