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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ca1f6b7d91f5a8b6ed076cf07d7674834ac7e18394508908e9da9e3bf2ec94d' 
  AND token = 'Z4lRw2yNfHCofe5+ynY6hOif9lIxGJ4XMRHS9A9XVMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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