SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0771597e24c2a60086f8ace308c42e4de125fa8c1a331e95fe639b153c7cb35f' 
  AND token = 'ZYDJJT+yVHhvEftH6/gnX1zj0M8gW89wlTOat8dgVPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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