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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30a37b42cadffeb45505630b4cd4e7b20c9d7adf4e5b22c0ee193fa16fcf3bdf' 
  AND token = 'UDxc6bwIAz1grdwfiSN1YBY2OyjdMe3RC3SThaeKlAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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