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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e746b52c77f411cf899fcb7eafe4475914fdd1024c70b99567234e05f0d5182' 
  AND token = 'CmWKc9LvvqLSX9lUj62hW6t2jza0c1P+aGvvlqKlD40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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