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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '632f5035e9905ddd4cd46d733fd5eda981700948db15b84bf8afc724e93da064' 
  AND token = 'XOQW4pdwjGjSp+Y6R2kbG64jYtyXE5FtD8b0PHFR03A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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