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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2844afc9a7d77a2ead5be18d0d015deec4021f6fd962d0bdb93f4cbf8a03f7c7' 
  AND token = 'XY78+EPHtkDNxMdVCxeSsHWqj+zkbrERhzx4MHuJ8cA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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