SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11e4392f80011b2654ebecef579fa38986abde52a4d528668f650d14c4d773d4' 
  AND token = 'jxmC3iI74K2dMUQuvw/Z+Ur8M3dGCI7+ZH+OnJL+lCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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