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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c72c295441fe1da257f4fa1aa1fe62cdd5fb28ff43743cc456db33fc253de59' 
  AND token = 'ZNdCx6+j1BdiFH6VCs9Ku56n9EzAKnNFadif6jQRzZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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