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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9744b64bda21444e24f1ccb4882a43555658581cd42025f63375008ad9c9179' 
  AND token = '+G64oI6Q7euWH6dq6LWMK27QnV/efp2UCUnttXlH8f0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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