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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bbfca0382180eeb5cb4a79b1fda8fb7b347d79b650fa44bdfc21b8c4e30527e' 
  AND token = 'cI/Roidd2F6ccU2HmExfUqhtofwzWqdkAZbkXM3+7mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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